[AD] al_drain_audio_stream hangs when stream is not attached to mixer

[Anders Andersson <trezker@xxxxxxxxxx>]

Something I discovered while playing with generating my own stream data.

Attached is a small example that consistently shows the problem.
A snippet that attaches the stream to a the default mixer is commented
out, if you uncomment it the program does not hang.

#include <stdio.h>

#include "allegro5/allegro5.h"
#include "allegro5/allegro_audio.h"

#define SAMPLES_PER_BUFFER    1024

int main(void)
{
   ALLEGRO_AUDIO_STREAM *stream;

   if (!al_init()) {
      fprintf(stderr, "Could not init Allegro.\n");
      return 1;
   }

   if (!al_install_audio(ALLEGRO_AUDIO_DRIVER_AUTODETECT)) {
      fprintf(stderr, "Could not init sound.\n");
      return 1;
   }
   al_reserve_samples(0);

   stream = al_create_audio_stream(8, SAMPLES_PER_BUFFER, 22050,
      ALLEGRO_AUDIO_DEPTH_UINT8, ALLEGRO_CHANNEL_CONF_1);
   if (!stream) {
      fprintf(stderr, "Could not create stream.\n");
      return 1;
   }

/*   if (!al_attach_audio_stream_to_mixer(stream, al_get_default_mixer())) {
      fprintf(stderr, "Could not attach stream to mixer.\n");
      return 1;
   }
*/

   al_drain_audio_stream(stream);
   al_destroy_audio_stream(stream);
   al_uninstall_audio();

   return 0;
}
END_OF_MAIN()

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